What actually happens at an autism assessment

You have waited months, possibly years. Knowing what the appointment will actually involve removes a surprising amount of the dread.

Who will be there

Good practice is a multidisciplinary team, though not everyone is in the room at once:

• A paediatrician or child psychiatrist — developmental and medical history, differential diagnosis
• A clinical or educational psychologist — cognitive profile, structured observation
• A speech and language therapist — communication, social use of language, play
• An occupational therapist — sensory processing and motor skills, where relevant

Some services run everything in one long session with several clinicians. Others spread it over separate appointments. Both are normal.

Part one: the parent interview

This is usually the longest and most important component, and it often happens without your child present.

Expect to be asked, in considerable detail, about:

• Pregnancy, birth and early health
• Milestones — when your child sat, walked, babbled, said first words
• Any loss of skills, and when
• How your child plays, alone and with others
• How they communicate wants, needs and feelings
• Response to change, routines and transitions
• Sensory responses: noise, texture, food, clothing, light, movement
• Repetitive behaviours and intense interests
• Sleep, eating, toileting
• Family history of autism, ADHD, language difficulty or mental health conditions

Structured interviews such as the ADI-R or DISCO can take two to three hours. It is exhaustive by design.

Part two: observing your child

The best-known tool is the ADOS-2 (Autism Diagnostic Observation Schedule). It is not a test your child can pass or fail, and it is not a quiz.

A clinician sets up a series of everyday play situations and watches how your child responds. They might:

• Activate a wind-up toy and let it stop, to see whether your child requests more and how
• Create a mild surprise and see whether your child looks to share the moment
• Offer a snack that requires asking
• Set out toys to see whether pretend play emerges
• Attempt conversational back-and-forth
• Introduce a small social difficulty and observe the response

They are recording specifics: joint attention, gesture use, eye contact quality, imagination, conversational reciprocity, repetitive behaviour.

For older or verbal children, the observation looks more like a conversation — describing friendships, feelings, a favourite topic, and interpreting social scenarios.

Part three: information from school

Most services request a report from nursery, school or childcare, sometimes with a classroom observation. Teachers see your child in an environment you never do — a noisy room with thirty peers and constant unstructured social demand.

If your child masks at school and unravels at home, warn the team explicitly at the start. Ask them to record the discrepancy. It is a recognised pattern, particularly in autistic girls, and it should be interpreted rather than treated as contradiction.

Additional assessments

Depending on the picture, the team may add:

• Cognitive assessment (WISC, WPPSI or similar) to map strengths and difficulties
• Speech and language assessment, including comprehension versus expression
• Sensory profile questionnaire, usually completed by you
• Hearing test — often required before diagnosis
• ADHD screening, since ADHD co-occurs in a large share of autistic children
• Genetic testing or medical investigations, in specific circumstances

How to prepare your child

Adjust for age, and keep it factual:

Under 5: “We’re going to a place with toys. A person is going to play with you and ask Mummy some questions. It will take about an hour, then we’ll get an ice cream.”

5 to 11: “We’re seeing a doctor who helps work out how different brains work. There aren’t any injections. Some of it is playing and talking. It helps us understand what makes things easier and harder for you.”

Teenagers: be honest and include them in the reasoning. Many older children are relieved. Some are frightened by the word — that fear is usually about stigma, and it is worth addressing directly rather than avoiding the topic.

Practical preparation that helps: bring snacks, a familiar comfort item, headphones, and something to do while waiting. Ask in advance about the waiting room, lighting and noise. Schedule for your child’s best time of day.

Do not coach. Do not tell them to make eye contact or sit still. A performance produces the wrong answer, and the cost of a wrong answer is another two-year wait.

Getting the outcome

Some services tell you the same day; most arrange a feedback appointment within a few weeks, with a written report four to twelve weeks later.

The report should include the diagnosis (or the reasoning for not giving one), your child’s strengths, their support needs, recommendations for home and school, and any onward referrals.

Read it carefully when it arrives. Factual errors — wrong dates, misattributed quotes, missing information — are common and worth correcting, because this document will be used by schools and services for years. Ask for corrections in writing.

If the answer is no, ask two questions: what explains the difficulties you described, and what support is being recommended regardless. “Not autistic” is not the same as “nothing is going on”, and it should never be the end of the conversation.

If the answer is yes, what to do in the first 30 days covers where to go from here, and autism levels explained decodes the terminology in the report.